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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658314ad2efae6daae449f0fe8cbe178ef7ed8db6ba8d2efb9b961fa64129f60' 
  AND token = 'iF5pWO+6YHBFaRRtguFpU4c4EWluE/TOMwU8mBZ10Sg=' 
  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"
    }
  }
}