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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7143da7f715d4adf19aada5820a818b4e98f7559b5636877a2fdbff60f57210' 
  AND token = 'OHo7ufn2+TeZWFd9so8kD7zO0F99csw8NQKAxu+6RPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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