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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2da0cf30e4af27959c997fe88046ca2d00f0d782ed7c7670919b3921c24f59d' 
  AND token = 'Pi4jBDPeEX77IZO6fCk4KF09FZr/blIGgK4+FslgImo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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