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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8e6f0dafaf067bc8e5c18c154e1266ff2eb498bf2be12de7c4f1f8d5cdf8f99' 
  AND token = '3NAUeO7B/+QZYt60/PHLEQGD3laevLOofI0HgSqvpUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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