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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '022ceb194bd1a0ed4973e2ff806d70d4e23ee8ffa11a29b33c13451e041b1f10' 
  AND token = 'OpaaFQpfwXrJV18pOKiKS0fjseRHH4n1cNyhm+KAu9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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