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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1195baad2afdb167c7786788705a8104a55bbf4e90d4b51f358dee55997c97' 
  AND token = 'jBj7+rJOmOyOSb+JV4NMf2B2+dDe6p18RH4d79cYPKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}