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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af17687a6747abfb4c8e44a5e115a10c1cdbaa56fcc4df2c3c9fe1c5b72239b1' 
  AND token = 'R3c61Xudb6lgk1Tzc+MS9EqqOhIEbGrhduOosfGkMPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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