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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47162946260eadf0ed500fb06b59a7782bebc73bd0e84dbfc5734282092bcdd2' 
  AND token = '6YU25J7z1bSZBcm1P7tTU6RA3oQLdjioQK7/A+tv7ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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