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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfba4a6de5b445b8229709baa49a30af28622e25d0dd8960e5874bd0d06e7e05' 
  AND token = '54kF1J5P2NwTkKwU1V+cvLcqI+UdyZR4/bZSIEER5Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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