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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9fa9212b7836320f40e6b1c2d3891bc55cb4a079bd46cfee70c30a52632d14' 
  AND token = 'JR1dkGLIfogCHrbgJNDVQy6ePXA9Q9cKZRtmzR53C0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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