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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe62ae3f494eaa61d776c840ccb5d1a741337e1951c4bb3424d5853030ea7e9e' 
  AND token = 'KT0qxewjZ2wlSOcAAnlyZ3SIZtdN9QqJBsXheBR7II4=' 
  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"
    }
  }
}