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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350fd725b76a96cc09a4b223499475d2578f9c32b087b5826e772746860e3e53' 
  AND token = 'Aoeu2G+5WMDLCgAUV7IMj4BD2orUE9zE670oE2Rc5Dg=' 
  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"
    }
  }
}