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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4d8b0a474f4bec64d5270e3c13c69880f451d9e1e3014c588642e2f9a70c8f' 
  AND token = '+zgQFvI0v/CA9XVeJWSuLo3AEHJKoTv/nx9hLldecec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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