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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd787d6a044eb96376d2c96c74647c022ec9f63ceb4b5f05896c69b0b5cef15' 
  AND token = 'cgEETtxKLfw90hk3Zjn9uhrx6k5+pnR8TRt/w+VwW/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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