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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3726524730e67f7b923c2f2be91f2f511f15ad4cf8907c00e7b50da8005fc949' 
  AND token = 'Wv+d9bChS1/5qpbYnMxD+ms1EvMTjWDmtYoXUmtQtpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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