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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5d2a34c4508501a4dcbcc07ccdbfa25397e2062e1a4a301d053564e1a85110' 
  AND token = 'o7UVFBpmJA+jmOoKl6V+W6+50tQEtwT6OoIlFdtVJ6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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