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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '888e49055e399bc5b1f61bbcd7219097a35889b47c3ad4affea9a8d865d1a445' 
  AND token = 'Qw4EZWxdAZ4QUHW2nz4njWSyZ9HGBGakOcz3H7Z+2rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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