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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e61f5ab8543aea3ca2237aaf84c6485e7170c920d490a1a00780def184a003' 
  AND token = 'uF1XYMF7/0/q/frHMinbDDudVmziFpE+9NJ/itMTZ2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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