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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93954a1c8bec6db7b880cf42c37bdaf81d5935cae70df3f5444dbf532a44a422' 
  AND token = '9yIbRgf1N48nbso/vFNGYT2FWsc5JjnW6GT5klj+laI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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