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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf43be75c9956990d46b6b3db0bd0f9066f827fe4d2209c56662cb1da667db8' 
  AND token = 'a2fbfr2xjR4V5/BuSvZAvw0BWpA00Q1ZJZrIQta7WYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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