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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f31bc32d652ab25233f6a767e45c23f7af9f947183d30a7d1bdb90ff86aaf53' 
  AND token = 't/Ffs9sIXI+S3CXCRRDFm3JEw/I+dTBMKyfqsSAaG/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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