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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e93717d7b6193a731168896d68431c8f74a56408a4583cdb4316c7e236f1cec' 
  AND token = 'GO8pi7m8GBwWhCpdhYhpLvCtkz9MzQs68/cuttQy2t4=' 
  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"
    }
  }
}