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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0606ca6ab6accb42f0b601d2c702532f87a3e1b5dfeffa3690d9d69e76e264c' 
  AND token = 'u9is8OVFP4J40V9nDmhpmL0ftrSKdTG5en3YDo5rrEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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