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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68482197bbc42b5123b00c3e06a1d43fc25ca4611fb61ffcf8d0d5670a006870' 
  AND token = 'n0PxJVEMLJMxSDEvZMp6WC2kC7bth9oivwwp+wdaMdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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