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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919e311a31ba23163df62b85ec1b3e6c75eb67a1d8333a6a10d2c18b46e72e7f' 
  AND token = '/95WZSf+HLYQjC3/X+TNLb4HFuDUBpgXxZf6Y40qMYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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