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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e169106442465fe905bcf2f311f0ef908b7020bf64bd79681b207b2ddaff4525' 
  AND token = '9ASRjLkCIpzbupOt1/T1ezeX6ENuInEC+Q4J5GmabLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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