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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be90de74356f019ed1a07f51531cf03399b6fb0a07232af00faf54a50a36cba3' 
  AND token = '7HHKLdbMxYvvhb+E/iL4YpFKxBL8v/HZeEL1o+O4Ig0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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