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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8310173d25f8f08aefd918df1fac7562af2fcf9966a472bca044d31cfb389ce8' 
  AND token = '3trKFXyC2JtMF7UcQEk8b+ySWORsw+90tL5nq35rAAs=' 
  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"
    }
  }
}