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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498795fd5f0fb9c5a501d9b0e229041cc033744d95371c06c8020444cffa80cd' 
  AND token = 'bpAM3aZTMZkvUd+xD05DCz3DM5bOOW5vudhX0jludvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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