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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97c0dce5399ee66c94db421b976a75d3d23c6d1da9b8bb6adc5bd29c12765dc' 
  AND token = 'xCaZghMJJYrmhFy25RobnC0SvktSuf4b7KIx+Noaaz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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