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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386097be20a50cea6f9cdc6b1bc3bd6a445273492e7d9d502d7a5eae5604b2e5' 
  AND token = 'WCInrNIyfhWJNuGNAZJ1BQSQ7BPBy+WnhypRtHLeado=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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