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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5268824bbd1587735c0518b233fc539052c28733a87dee2f8009bf2c46ec1c1' 
  AND token = 'fw1tNV63RT+6YH+ixJgI2W+jFPigFp7c+mU8T/lnD1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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