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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb1456d907b65780e453faf50f4c20c2f06c34153c2b305afe82468a5aaae4d' 
  AND token = 'jLdTLFlpMnWB9ttdi4CajybCJ52AlXQDv7p9XIjr6nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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