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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45c6e0a4c26f8a2e1580619bde618da732a1d26ad726cf8362b24d8ca535db4f' 
  AND token = '4x8wc9Frqc7Eljbj2urloZZgkcQvKafnXK0cfvsKr5Q=' 
  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"
    }
  }
}