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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f176feb42f66dac34c0a0ac29c911f6c033d97914936f075116e76801fb0572' 
  AND token = '0lywpHXlC7sqJK1L4Qpw5C2MfBUmALFL4zlf69sSFEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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