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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e6da75664473ba97833ffb327b8b177719cd261dce601238c654397b42c4c2' 
  AND token = 'ssI2ZGIiuIMt9B0ItsSBP/ruGcww2bKIyVJnE+G85QE=' 
  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"
    }
  }
}