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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3bf4a66ce4e2970559dbd808fded0bd86d3ec43bc51c5c1ceb60a391593d70' 
  AND token = '+wuToXrLPpQDfme4Xe96kYKXtZO0lynqsB+79Lu/17M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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