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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b430e2f065a514ca927f2199ccefd45ccc04488c7fac5114c69b872b0dc1f0a' 
  AND token = 'mMXj9POgOpDRAn+W6rzjRd5eqqd4X2+f6y6ZcIzEuRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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