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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a30af5e2bbcc31e27451923e9ba036e19b3cea110460c4f72e3e92adaa152cf' 
  AND token = 'JBRRHAgXU0JSxKdhkMFJSS2TiFb71FBTDYI8+B4B3Q0=' 
  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"
    }
  }
}