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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3576103e202bc0012929d333073d28fce39a03c6accb7d45342a21da08307e1d' 
  AND token = 'qnYqa604NJw5jHWeU27yKU1vjWmsp7lD333gN0gQopc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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