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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df46be19c9a783429737118c588e7beec9c89c2d9166a7f4ca67254366b7e92e' 
  AND token = 'RJZ68vuseQ0FA9RD8TY3qOK5nF3quk04CzW52YpoKWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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