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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a95eaaa3930835f272bb460d1d68104446788d644f43c8b1f058197428a8ff7' 
  AND token = 'uC2pfih8yp7kVbfSuviq0ZwSgy1Lw8VbS0olVdGDJZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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