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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe09d9d0c159e7693930860893c3dac9f4ab418abde9cb19c2a565bd00d3c5ff' 
  AND token = 'gUaSmlE5b8f7idg5a8QfVfEic/0IUctdyOON0m50Eas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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