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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db48549c1a1dbe2ba2f1d1506f9ac4a37f6524c657ac39fd29d6cd6f6a6edc6' 
  AND token = 'yFmV8AUMGcuvhfK++sHfJycicxIcK5d3+rJKN2kIL0A=' 
  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"
    }
  }
}