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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ab00f1a730882898e49c5e1d435805ceba6c18c220290fd72843d46162e0a4' 
  AND token = '3QvQmN6LoUs5M/8/VQwJbHliv1M+TYpS1PmZao+u6rc=' 
  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"
    }
  }
}